BEIRUT • Rebels shot down a Syrian military helicopter in northern Syria on Tuesday, killing its crew members in a fiery crash, while the government kept up its relentless bombing campaign on the opposition-held region, with an airstrike in which seven civilians died, activists and news reports said.

The violence in Idlib province came as government troops moved closer to capturing the last rebel-controlled section of a strategic highway linking southern and northern Syria, which would bring the road under the full control of President Bashar Assad’s forces for the first time since 2012.

With support from Russia and Iran, Syrian troops have been on the offensive for weeks in Idlib and parts of nearby Aleppo provinces, unleashing a humanitarian crisis with 700,000 people fleeing their homes and surging north toward the Turkish border.

Nearly a quarter of the 3 million people in Idlib and nearby areas have fled. Terrified families piled onto trucks and other vehicles, clogging muddy rural roads in yet another harrowing exodus in the conflict, now in its ninth year.

Hundreds of civilians have died in the latest fighting, according to the United Nations.

The Syrian helicopter gunship was shot down by insurgents amid fighting near the village of Nairab as rebels, backed by Turkish artillery, tried to retake it after losing it last week, according to opposition activists.

The Associated Press video showed the helicopter spiraling from the sky and breaking up as fire poured from its fuselage, just before it crashed.

Two bodies could be seen on the ground.

A Syrian government helicopter is shot down Tuesday by a missile in Idlib province, Syria.

the associated press